In the early days you will only be taking in fluids so don't worry too much about how often you need to poo at first.
I think I went every three days or so at first, but once I was on the runny food stage week two onwards, I upped this to every two days or so, and now I am an almost daily plurper
Make sure your fluid levels are high as dehydration can cause constipation, and if it continues or you feel and pain get your bum to your GPs for a proper assessment
I am sure you will be fine honey